AP1519 [ANACHIP]
300KHz, 2A PWM Buck DC/DC Converter; 为300KHz ， 2A PWM降压型DC / DC转换器
| 型号： | AP1519 |
| 厂家： | 
ANACHIP CORP |
| 描述： | 300KHz, 2A PWM Buck DC/DC Converter |
| 文件： | 总9页 (文件大小：172K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP1519
300KHz, 2A PWM Buck DC/DC Converter
Features
General Description
- Adjustable version output voltage range, 0.8V to
18V+4%
The AP1519 is monolithic IC designed for a
step-down DC/DC converter, and own the ability of
driving a 2A load without additional transistor. It
saves board space. The external shutdown function
can be controlled by logic level and then come into
standby mode. The internal compensation makes
feedback control having good line and load
regulation without external design. Regarding
protected function, thermal shutdown is to prevent
over temperature operating from damage, and
current limit is against over current operating of the
output switch. If current limit function occurs and
VFB is down below 0.5V, the switching frequency
will be reduced. The AP1519 series operates at a
switching frequency of 300KHz thus allows smaller
sized filter components than what would be needed
with lower frequency switching regulators. Other
features include a guaranteed +4% tolerance on
output voltage under specified input voltage and
output load conditions, and +15% on the oscillator
frequency. The chips are available in a standard
8-lead SOP-8 package.
- 300KHz +15% fixed switching frequency
- Voltage mode non-synchronous PWM control
- Thermal-shutdown and current-limit protection
- ON/OFF shutdown control input
- Operating voltage can be up to 22V
- Output load current: 2A
- SOP-8L Pb-Free packages
- Low power standby mode
- Built-in switching transistor on chip
Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
Pin Assignments
Pin Descriptions
Name
VIN
Description
Operating voltage input
Switching output
(Top View)
V
IN
GND
GND
GND
GND
1
8
Output
FB
SD
2
3
4
7
6
5
Output
GND
FB
Ground
SOP-8L
Output voltage feedback control
ON/OFF Shutdown
SD
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.0 Oct 5, 2004
1/9
AP1519
300KHz, 2A PWM Buck DC/DC Converter
Ordering Information
AP1519 X X
Package
Packing
Blank : Tube
S: SOP-8L
A
: Taping
Block Diagram
SD
VIN
200mV
220mV
Current
2.5V
0.8V
Start
up
Source
bias
Regulator
Reference
+
Comp
_
_
Comp
+
Frequecy
compen-
sation
+
_
_
Amp
2A
Comp
Pre-driver
FB
Switch
+
Output
Gnd
Thermal
Shutdown
300kHz
OSC.
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct 5, 2004
2/9
AP1519
300KHz, 2A PWM Buck DC/DC Converter
Absolute Maximum Ratings
Symbol
VCC
Parameter
Rating
+24
Unit
V
Supply Voltage
VSD
VFB
VOUT
PD
TST
ON/OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating temperature
Operating voltage
-0.3 to +18
-0.3 to +18
-1
V
V
V
W
oC
oC
V
Internally limited
-65 to +150
-40 to +125
+4.5 to +22
TOP
VOP
Electrical Characteristics (All Output Voltage Versions)
LOAD = 0.5A
USnleysms botohelrwise specifiPeda,rVam=1e2tVe.rI
Conditions
VFB=0.8V
(Adjustable version only)
Min.
Typ.
Max.
Unit
IN
-50
-100
345
345
IB
Feedback bias current
-10
nA
255
220
300
FOSC
FSCP
Oscillator frequency
KHz
KHz
Oscillator frequency of When current limit occurred
10
30
50
1.4
1.5
short circuit protect
and VFB < 0.5V, Ta=25 oC
IOUT=2A
VSAT
DC
ICL
Saturation voltage
1.25
V
%
A
No outside circuit
VFB=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
Peak current
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
100
0
Current limit
No outside circuit
VFB=0V force driver on
No outside circuit
VFB=12V force driver off
VIN=22V
3
Output
Output = 0
-200
uA
IL
leakage
current
Output = -1
-5
5
mA
mA
IQ
ISTBY
VIL
Quiescent Current
Standby Quiescent
Current
VFB=12V force driver off
ON/OFF pin=5V
10
150
200
0.6
70
uA
VIN=22V
Low (regulator ON)
-
ON/OFF pin logic input
threshold voltage
1.3
V
VIH
High (regulator OFF)
2.0
-
ON/OFF pin logic input
current
IH
IL
VLOGIC=2.5V (OFF)
-0.01
-1
uA
ON/OFF pin input current VLOGIC=0.5V (ON)
-0.1
15
Junction to
case
Thermal Resistance
SOP-8L
oC/W
oC/W
ΘJC
Thermal Resistance
With copper area of
approximately 3 in2
Junction to
ambient
ΘJA
SOP-8L
70
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct 5, 2004
3/9
AP1519
300KHz, 2A PWM Buck DC/DC Converter
Electrical Characteristics (Continued)
Sym.
Parameter
Conditions
Typ.
Limit
Unit
V
Output
5V < VIN < 22V
0.784/0.768
0.816/0.832
VFB
0.8
VMIN
VMAX
Feedback
0.2A < ILOAD < 2A
VOUT programmed for 3V
VIN = 12V, ILOAD=2A
η
η
η
η
Efficiency
Efficiency
Efficiency
Efficiency
75
76
81
90
%
%
%
%
AP1519
VOUT programmed for 3.3V
VIN = 12V, ILOAD=2A
VOUT programmed for 5V
VIN = 12V, ILOAD=2A
V
OUT programmed for 12V
V
IN = 16V, ILOAD = 2A
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct 5, 2004
4/9
AP1519
300KHz, 2A PWM Buck DC/DC Converter
Typical Application Circuit
(1) Normal Circuit
R2 1K
Vin
R1 250
Ω
FB
12V
DC Input
L1
3
1V/2A
Output Load
22uH
Output
1
4
AP1519
2
8
Inductor
5
6
7
D1
SD GndGndGnd Gnd
Cin
Capacitor
Co
Capacitor
Schottky
Diode
R1
)
Vout = VFB ×(1 +
R2
(2) Delay Start Circuit
R2 1K
Vin
R1 250
Ω
FB
12V
DC Input
L1
3
1V/2A
Output Load
22uH
Output
1
4
AP1519
2
8
Inductor
CDELAY
0.1uF
5
SD
6
7
D1
Co
Capacitor
GndGndGnd Gnd
Schottky
Diode
RDELAY
10K
Cin
Capacitor
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct 5, 2004
5/9
AP1519
300KHz, 2A PWM Buck DC/DC Converter
Typical Performance Characteristics
AP1519 Efficiency v.s. Temperature
(Vin=12V,Vout=5V,Io=2A)
AP1519 Efficiency v.s. Temperature
(Vin=12V,Vout=3.3V,Io=2A)
86
85
84
83
82
81
80
79
78
77
76
75
81
80
79
78
77
76
75
74
73
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
AP1519 Saturation Voltage v.s. Temperature
(Vcc=12V,Vfb=0V,VSD=0)
AP1519 Switch Current Limit v.s. Temperature
(Vcc=12V,Vfb=0V)
1.4
5
4.5
4
1.3
1.2
2A
1.1
1A
1
3.5
3
0.5A
0.9
0.8
2.5
0.7
-50
-30
-10
10
30
50
70
90
-50
-25
0
25
50
75
100 125
Temperature (TA) (°C)
ꢀ
Temperature (TA) (°C)
AP1519 Supply Current v.s. Temperature
(Vcc=12V , No Load ,Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
15
14
13
12
11
10
9
60
55
50
45
40
35
30
Switch OFF
8
Switch ON
7
6
5
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct 5, 2004
6/9
AP1519
300KHz, 2A PWM Buck DC/DC Converter
Typical Performance Characteristics (Continued)
AP1519 Threshold Voltage v.s. Temperature
AP1519 ON/OFF Current v.s. ON/OFF Voltage
(Vcc=12V , Io=100mA)
(Vin=12V)
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.9
0.8
0
3
6
9
12
15
18
21
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
ON/OFF Voltage (V)
AP1519 Frequency v.s. Temperature
(Vcc=12V , Io=500mA ,Vout=5V)
AP1519 Feedback Current v.s. Temperature
(Vcc=12V , Vout=5V,Vfb=0.8V)
320
310
300
290
280
270
10
0
-10
-20
-30
-40
-50
260
-50 -30 -10 10 30 50 70 90 110 130 150
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1519 Output Voltage v.s. Temperature
(Vin=12V ,Io=2A)
3.5
3.45
3.4
3.35
3.3
3.25
3.2
3.15
3.1
3.05
3
2.95
2.9
-40 -20
0
20 40 60 80 100 120 140 160
Temperature (TA) (°C)
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct 5, 2004
7/9
AP1519
300KHz, 2A PWM Buck DC/DC Converter
Function Description
Pin Functions
Thermal Considerations
The SOP-8 package needs a heat sink under most
conditions. The size of the heatsink depends on the
input voltage, the output voltage, the load current
and the ambient temperature. The AP1519 junction
temperature rises above ambient temperature for a
2A load and different input and output voltages.
The data for these curves was taken with the
+VIN
This is the positive input supply for the IC switching
regulator. A suitable input bypass capacitor must be
presented at this pin to minimize voltage transients
and to supply the switching currents needed by the
regulator.
AP1519 (SOP-8 package) operating as
a
Ground
buck-switching regulator in an ambient temperature
of 25oC (still air). These temperature increments
are all approximate and are affected by man factors.
Higher ambient temperatures requires more heat
sinker.
Circuit ground.
Output
Internal switch. The voltage at this pin switches
between (+VIN – VSAT) and approximately – 0.5V,
with a duty cycle of approximately VOUT / VIN. To
minimize coupling to sensitive circuitry, the PC
board copper area connected to this pin should be
minimized.
For the best thermal performance, wide copper
traces and generous amounts of printed circuit
board copper should be used in the board layout.
(One exception is the output (switch) pin, which
should not have large areas of copper.) Large
areas of copper provide the best transfer of heat
(lower thermal resistance) to the surrounding air,
and moving air lowers the thermal resistance even
further.
Feedback
Senses the regulated output voltage to complete
the feedback loop.
SD
Allows the switching regulator circuit to be
shutdown using logic level signals thus dropping
the total input supply current to approximately
150uA. Pulling this pin below a threshold voltage of
approximately 1.3V turns the regulator on, and
pulling this pin above 1.3V (up to a maximum of
18V) shuts the regulator down. If this shutdown
feature is not needed, the SD pin can be wired to
the ground pin.
Package
thermal
resistance
and
junction
temperature increments are all approximate. The
increments are affected by a lot of factors. Some
of these factors include board size, shape,
thickness, position, location, and even board
temperature. Other factors are, trace width, total
printed circuit copper area, copper thickness, single
or double-sided, multi-layer board and the amount
of solder on the board.
The effectiveness of the PC board to dissipate heat
also depends on the size, quantity and spacing of
other components on the board, as well as whether
the surrounding air is still or moving. Furthermore,
some of these components such as the catch diode
will add heat to the PC board and the heat can vary
as the input voltage changes. For the inductor,
depending on the physical size, type of core
material and the DC resistance, it could either act
as a heat sink taking heat away from the board, or it
could add heat to the board.
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct 5, 2004
8/9
AP1519
300KHz, 2A PWM Buck DC/DC Converter
Marking Information
SOP-8L
(Top view)
Logo
Part Number
1519
YY WW X
Date Code
X: Internal code
WW: Nth week
YY: Year
Package Information
Package Type: SOP-8L
L
VIEW "A"
0.015x45
D
7 (4X)
7 (4X)
e
B
VIEW "A"
y
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
1.40
0.10
1.30
0.33
0.19
4.80
3.70
-
Nom.
1.60
-
Max.
1.75
0.25
1.50
0.51
0.25
5.30
4.10
-
6.20
1.27
0.10
8O
Min.
Nom.
0.063
-
Max.
A
A1
A2
B
0.055
0.040
0.051
0.013
0.0075
0.189
0.146
-
0.069
0.100
0.059
0.020
0.010
0.209
0.161
-
0.244
0.050
0.004
8O
1.45
0.41
0.20
5.05
3.90
1.27
5.99
0.71
-
0.057
0.016
0.008
0.199
0.154
0.050
0.236
0.028
-
C
D
E
e
H
L
5.79
0.38
-
0.228
0.015
-
y
0O
-
0O
-
θ
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct 5, 2004
9/9
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